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Denna webplats är tvåspråkig, finns på både svenska och englska. För er som föredrar andra språk, har vi lagt till "google translate". Kom ihåg att automatiska översättningar ibland ger konstiga resultat...

- Glass melting furnaces
- Glass pots
- Pressing, a general description
- Pressed glass, some examples
- Centrifuging
- Vacuum flasks

When the press became common

As we have seen, the glass press made its entrance in the 1830ies: first Reijmyre, then Skönvik, Kosta... Soon there were presses on many glassworks.

There were experiments with different types of presses, different materials for moulds. Strömberg (Kostaglaset 1742-1916) writes about ceramic moulds, moulds made of brass and, later, iron.
The moulds could be very complex, like this one in four parts (probably made at Stenbergs in Lindås):

saltcellar with mould
Considerable skill was needed to get a "good" product out of this mould, ie that the glass filled every cavity of the mould - the melt had to be fluid (hot) enough, but not too hot, because too hot glass tends to stick to the mould. The mould itself had to be pre-heated to the optimal temperature.

All moulds were not complex: the fruit bowl below is made in a two-part mould. The bowl and the stem were made in one piece. On the right-hand picture the seam of the mould is clearly seen on the stem.

fruit bowl with stem     the seam of the mould is clearly seen

The next example is also made in simple moulds: the bowl is made separately, as is the stem - next, the two parts have been joined "hot". This bowl is an example of a bad product: the glass is bad (bubbles, threads and other faults), the join between bowl and stem is ugly - but it is easy to see how it is made.
bowl with a separately made stem    the join between bowl and stem
 is ugly with bubbles    obvious seam on the stem
Here you can read about the two presses we show in the museum.

I found a vides showing comtemporary hand pressing. They make a bowl, that can be used "as is", but it can then be flared into a dish. The dish can be swaged and can get a handle added, making it into a "candy basket".

It is obvious that the moulds are an important part of the end result. I fould another video about making moulds for pressing glass: